準2次元系での結晶成長と拡散場のその場観察

抄録

Growth of NaClO₃ crystals from aqueous solution in a quasi-two-dimensional system was studied to analyse the growth mechanism under a diffusion-limited transport process. Special care was paid to eliminate bulk transport processes such as convection and stirring. Whiskers were used as the seed crystals to control the dislocations. Thus, R-σ curves were experimentally obtained referring to the perfect and imperfect growth interfaces. The growth rate and concentration distribution around the crystals were measured in situ by transmission multiple-beam interferometry, using a special growth cell. From the analysis of experimental data, important parameters in crystal growth were obtained as follows; (1) the critical supersaturation for two-dimensional nucleation: σ*=0.04. (2) the step energy: γ= (10±3)×10^-22 J/ion (3) the area of diffusion field at the steady state growth expanded as thegrowth rate increased.